iOS-OC-NSDictionary和NSMutableDictionary用法大全详细说明

+ (void)NSDictionaryCreateMethod{    NSDictionary *dict = @{@"one":@"1",@"two":@"2",@"three":@"3",@"four":@"4"};    NSLog(@"dict = %@",dict);        //减方法    NSDictionary *dict1 = [[NSDictionary alloc] initWithObjectsAndKeys:@"1",@"one",@"2",@"two",@"3",@"three",@"4",@"four",nil];    NSLog(@"dict1 = %@",dict1);        //对应的加方法    NSDictionary *dict2 = [NSDictionary dictionaryWithObjectsAndKeys:@"1",@"one",@"2",@"two",@"3",@"three",@"4",@"four",nil];    NSLog(@"dict2 = %@",dict2);        NSDictionary *dict3 = [[NSDictionary alloc] initWithDictionary:dict];    NSLog(@"dict3 = %@",dict3);        NSDictionary *dict4 = [NSDictionary dictionaryWithDictionary:dict];    NSLog(@"dict4 = %@",dict4);        NSArray *keys = @[@"one",@"two",@"three",@"four"];    NSArray *objs = @[@"1",@"2",@"3",dict1];    NSDictionary *dict5 = [[NSDictionary alloc] initWithObjects:objs forKeys:keys];    NSLog(@"dict5 = %@",dict5);        NSDictionary *dict6 = [NSDictionary dictionaryWithObjects:objs forKeys:keys];    NSLog(@"dict6 = %@",dict6);}+ (void)NSDictionarySimpleMethod{    NSDictionary *dict = [NSDictionary dictionaryWithObjectsAndKeys:@"1",@"one",@"2",@"two",@"3",@"three",@"4",@"four",nil];    //字典中的键值数    NSLog(@"count = %lu",[dict count]);        //通过key找到对应的obj 不能通过obj  找到key    NSLog(@"%@",[dict objectForKey:@"three"]);        //遍历字典 枚举  或 快速枚举    NSEnumerator *e1 = [dict keyEnumerator];    id obj = nil;    while (obj = [e1 nextObject])    {        NSLog(@"key:%@,value:%@",obj,[dict objectForKey:obj]);    }        NSEnumerator *e2 = [dict objectEnumerator];        while (obj = [e2 nextObject])    {        NSLog(@"value:%@",obj);    }        //快速枚举 实际上是字典key的枚举    for(id objin dict)    {        NSLog(@"obj = %@",obj);//和 NSLog(@"dict = %@",dict); 打印的顺序是不一样的    }        NSArray *keyArray = [dict allKeys];    NSArray *objArray = [dict allValues];    for(int i =0;i<[dict count];i++)    {        NSLog(@"key : %@,value : %@",[keyArray objectAtIndex:i],[objArray objectAtIndex:i]);    }    }+ (void)NSMutableDictionaryCreateMethod{    NSDictionary *dict = @{@"one":@"1",@"two":@"2",@"three":@"3",@"four":@"4"};    NSMutableDictionary *dict1 = [[NSMutableDictionary alloc]initWithDictionary:dict];    NSLog(@"dict1 = %@",dict1);        //对应的加方法    NSMutableDictionary *dict2 = [NSMutableDictionary dictionaryWithDictionary:dict];    NSLog(@"dict2 = %@",dict2);        //创建一个空的可变字典    NSMutableDictionary *dict3 = [[NSMutableDictionary alloc] init];    NSLog(@"dict3&count = %lu",[dict3 count]);        //对应的加方法    NSMutableDictionary *dict4 = [NSMutableDictionary dictionary];    NSLog(@"dict4&count = %lu",[dict4 count]);        //可变字典自己的初始化方式    NSMutableDictionary *dict5 = [[NSMutableDictionary alloc] initWithCapacity:10];    NSLog(@"dict5&count = %lu",[dict5 count]);        NSMutableDictionary *dict6 = [NSMutableDictionary dictionaryWithCapacity:10];    NSLog(@"dict6&count = %lu",[dict6 count]);         }+ (void)NSMutableDictionarySimpleMethod{    NSMutableDictionary *dict = [NSMutableDictionary dictionaryWithObjectsAndKeys:@"1",@"one",@"2",@"two",@"3",@"three",@"4",@"four",nil];    //增加字典元素  或者修改  若果没有增加 若果有修改 覆盖    [dict setObject:@"5" forKey:@"five"];    NSLog(@"%@",dict);    [dict setObject:@"6666" forKey:@"five"];    NSLog(@"%@",dict);        //因为字典是无序的 没有 交换插入  追加    //删除    [dict removeObjectForKey:@"five"];    NSLog(@"%@",dict);        [dict removeAllObjects];    NSLog(@"%@",dict);//变成空字典了        //重设字典    NSDictionary *dict1 = @{@"one":@"111",@"two":@"222",@"three":@"333",@"four":@"444"};    [dict setDictionary:dict1];    NSLog(@"%@",dict);//变成空字典了        }